Telegraph instrument



Fly!

G. l. SHELTON.

TELEGRAPH INSTRUMENT.

LICATION FILED MA Patented Nov. 21, 1922.

Patented Nov. 21, 1922.

UNITED STATES PATENT OFFICE.

GEORGIELISAAC SHELTON, OF FORT WORTH, TEXAS, ASSIGNOR OF ONE-HALF TO ROYGINN, OF FORT WORTH, TEXAS.

TELEGRAPH INSTRUMENT.

Application filed May 31,

To all whom it may concern.

Be it known that I, GEORGE I. SHEL'roN, a citizen of the United States,residing at Fort Worth, in the county of Tarrant and State of Texas,have invented new and useful Improvements in Telegraph Instruments, ofwhich the following is a specification.

This invention relates to a telegraph instrument, and the object is toprovide an 1mproved form of contact for a sending device of theso-called autodot type.

A serious difiiculty in the type of instruments named is due to the factthat the resiliently mounted contact is disposed at a slight angle withreference to the stationary contact element, so that the circuit is notproperly completed, and when atmospheric conditions are bad, or whendust collects on the contacts, it is impossible to use the instrumentwith success. This slight angle is apparent when the resilient contactyields to the pressure of the pendulum.

One of the chief objects of the present invention is therefore toprovide a pair of contact elements each acting under the influence of aspring and maintaining approximate alinement under all conditions, withthe result that a reliable contact is made and the circuit is properlycompleted, or broken as the case may be, a split dot being animpossibility.

With the foregoing and other objects in View, the invention consists inthe novel construction, combination and arrangement of elementsdescribedand claimed, it being understood that modifications may be madewithin the scope of the claims, without departing from the spirit of theinvention.

In the drawings-Figure 1 is a top plan view of the instrument, andFigure 2 is a detail view showing the resiliently mounted contacts, inalinement, and the adjusting means.

1921. Serial No. 473,681.

Several of the elements of the instrument may be of standardconstruction, and referrlng to the drawings in detail, the base isdeslgnated 10, a vertical frame being shown at 12, and the arms 13 and14 carry adjusting screws 15 and 16. I

lnger pieces 18 and 19 are carried by the element 20. The pendulum isdesignated 21, and a spring 22 controlled by adjusting the screw 23serves the usual purpose. The circult is completed at 24 when sendingthe dash.

Carried by the element 21 is a collar 25 retained by a set screw 26, andthis collar is provided with a radial bore 27 in which the springcontact 28 is mounted.

cooperating contact 30 is in alinement with the contact element 28, andis mounted 1n a bore 31 of adjusting screw 32, being connected with themain line.

Hence these contacts maintain approximate alinement during operation,and the circuit will be fully completed, or sharply broken, anddifficulties arising from a weak current, due to imperfect contact willbe wholly avoided. I

Practical tests by experienced operators have fully demonstrated theutility and effectiveness of the device.

Having described the invention what is claimed is In a telegraph deviceof the class described, a p urality of adjustable elements each providedwith a bore, a contact pin mounted in each bore, a spring within eachbore serving to control the movement of the pins mounted therein, saidpins being movable in the direction of their longitudinal axes andmaintaining alinement with each other.

In testimony whereof I aflix my signature.

GEORGE ISAAC SHELTON.

